Example analysis of how to dynamically add tables in html-HTML Tutorial-php.cn

Example analysis of how to dynamically add tables in html

黄舟

Release： 2018-05-11 17:11:41

Original

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This article mainly introduces the example code for dynamically adding tables in HTML. Friends who need it can refer to it

Without further ado, I will directly post the code for you. The specific code is as follows:

<html>  
    <head><title>Table</title></head>  
    <body>  
        <table border="1">  
            <thead>  
                <tr>  
                    <td>First Name</td>  
                    <td>Last Name</td>  
                    <td> </td>  
                </tr>  
            <thead>  
            <tbody id="tb">  
                <tr id="1st">  
                    <td>张</td>  
                    <td>三</td>  
                    <td><input type="button" value="Add" onclick="add()">   
                    <input type="button" value="Del" onclick="del(this)"></td>  
                </tr>  
            </tbody>  
        </table>  
    </body>  
</html>  
<script>  
    function add() {  
        var trObj = document.createElement("tr");  
        trObj.id = new Date().getTime();  
        trObj.innerHTML = "<td><input name=&#39;firstName&#39;/></td><td><input name=&#39;lastName&#39;/></td><td><input type=&#39;button&#39; value=&#39;Add&#39; onclick=&#39;add()&#39;> <input type=&#39;button&#39; value=&#39;Del&#39; onclick=&#39;del(this)&#39;></td>";  
        document.getElementById("tb").appendChild(trObj);  
    }  
    function del(obj) {  
        var trId = obj.parentNode.parentNode.id;  
        var trObj = document.getElementById(trId);  
        document.getElementById("tb").removeChild(trObj);  
    }  
</script>

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In the above code, a table is first constructed in the body. In order to facilitate subsequent operations, we add thead and tbody tags to the table. Thead tag indicates the table header, and the tbody tag indicates the table header. Form body.

The table in the example has three columns, the first column is first name, the second column is last name, and the third column is the operation column.

The operation column contains two operations, one is to add rows to the table, and the other is to delete the current row. The operations of adding rows and deleting rows are tied to two buttons respectively. When the button is clicked, the corresponding add row/delete row operations are triggered.

Add row method

function add() {  
        var trObj = document.createElement("tr");  
        trObj.id = new Date().getTime();  
        trObj.innerHTML = "<td><input name=&#39;firstName&#39;/></td><td><input name=&#39;lastName&#39;/></td><td><input type=&#39;button&#39; value=&#39;Add&#39; onclick=&#39;add()&#39;> <input type=&#39;button&#39; value=&#39;Del&#39; onclick=&#39;del(this)&#39;></td>";  
        document.getElementById("tb").appendChild(trObj);  
    }

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The first line is to create a tr element, that is, create a table row.

The second line, trObj.id = new Date().getTime(); Add the id attribute to the new line, and assign a value to the attribute, taking the milliseconds of the current system, this is mainly Required when deleting.

The third line, trObj.innerHTML = "<td><input name='firstName'/></td><td><input name='lastName' /></td><td><input type='button' value='Add' onclick='add()'>

<input type ='button' value='Del' onclick='del(this)'></td>"; Assign a value to the table row, set the tag and through the innerHTMML attribute The html code content between tags is the line content to be added.

The fourth line, document.getElementById("tb").appendChild(trObj); Add the created table rows to the table body.

Delete row method

function del(obj) {  
    var trId = obj.parentNode.parentNode.id;  
    var trObj = document.getElementById(trId);  
    document.getElementById("tb").removeChild(trObj);  
}

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A parameter is passed in the delete method. In the add row method, we can see that in the delete method del The this parameter is passed, and this in the page code refers to the current HTML element, that is, the domain where this is located.

First line, var trId = obj.parentNode.parentNode.id; Get the id of the parent node of the parent node of the current element, that is, the id of the row to be deleted.

Second line, var trObj = document.getElementById(trId); Get the row element to be deleted.

The third line, document.getElementById("tb").removeChild(trObj); Delete this row in the main body of the table.

Flaws

The above code basically realizes the function of dynamically adding and deleting rows to the table, but the code still has flaws, mainly including Two points:

1 The width of the table changes before adding rows and after adding rows

Before adding rows

##Increase After the row

After adding rows, the table columns become wider

2 The page that the browser opens by default has garbled Chinese characters

You need to set the character encoding and modify the page encoding format before it can be displayed normally

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